Process of making material fob filtering- and decolorizing



:Patented Dec. 1925.

UNITED STATES To all whom it may concern: I

Be, it known that I, PHILIP L. WOOSTER, a citizen of the United States, and resident of Manhasset, New York, have invented certain new and useful Improvements in Processes of Making Material for Filtering and Decolorizing, of which the following is a full, clear, and exact description.

A material much used for the purpose of sugar, glucose and other oils is animal The value of char as a decolorizing agent 5 is, I believe,-due to the relatively large area of carbon or carbonaceous surface exposed in. a porous structure. While the total area of the carbon surface thus exposed is relatively large in bone char as compared with many other decolorizing agents within the class available for comerable portion of the surface of the .pores of commercial char that is composed of nonof the surface is composed of a combination of carbon or carbonaceous matter with noncarbonaceous matter, partly in- ,a state of mixture and partly in a state of chemical o union. My invention consists in so treating green bone and other similar carbonaceous ma- 'terial as to convert it into a suitable filtering and decolorizing agent having. a mate- 'ially increased carbon content over bone char as ordinarily prepared.

I The usual method of preparing char consists of first removing the grease and fat from the green bone by boiling or by dis- 46 solving it by "means of a suitable solvent such as benzene and then heatin it away from contact with free air, preerably to redness to carbonize it. The bone is then removed from the source of heat and allowed to cool in a closed receptacle whereby .free access of air is avoided and combustion of the carbon almost wholly prevented.

Tlieresult is a porous structure containing bonaceous material and characterized more cond tion by considsmble efficacy in the 10 filtering and decolorizing liquids such as charcoal, usually in the form commonly known as char, bone char or bone black} mercialuse, there is, nevertheless, a consid-' 25 :arbonaceous, material, and practically alluents and also increases the carbon a substantial proportion of carbon and cari PATENT- OFFICE.

PHILIP L. WOOSTEB, DECEASED, LATE OF MANHASSET, NEW YORK; BY ,LILLIAN D. WOOSTER, ADMINISTBAIRIX, OF MANHASSET, NEW YORK.

PROCESS OF MAKING MATERIAL FOR FILTERING AND DECOLORIZING.

Ho Drawing. Original No. 1,518,289, dated December 9, 1924, Serial No. 387,854, filed November 13, 1819, Application l'or'reissue filed August 5, 1925. Serial No. 48,481.

removal of color from liquids which come in two samples from different lots, are illustrative of grades of char commonly used for filtering and decolorizing sugarr 1st lot. 2nd lot.

, Per cent Per ce Oarbon 10. 18 9. .60 Phosphates of lime and magnesia..-" B0. 60 81. 93 Carbonate of lime 8. 43 7. 78 Sulphate of lime. 0. 20 0.23 Peroxide of iron. 0. 10 0. 12 Slliceous matters 0.29 0.18 Common salt (chloride of sodium)...; 0. 20 0. 16

It will be observed that in the case of these samples approximately 90% thereof in each case consists of constituents which have-. 10 appreciable eflz'ect so far as decolor- 1zing)is concerned. In fact some of them, nota ly theI-lime, have a deleterious efl'ect on the process as they not only tend to clog the pores of the material but have a positive retarding effect on the decolorizing action of the carbon. r My process efiI'ects among others the objects of decreasin the bone and carbonizing it and also e ects the elimination of a large proportion of the lime and lime compounds and other non-carbonaceous constitcontent of a givenvolume of bone.

When starting the manufacture of my product fromgreen bone, I proceed to boil and then to heat the bone in the usual manner above described and place it while still hot in a closed receptacle. In addition to the bone, however, I place in the receptacle at the same time a quantity of hydrocarbon,- for example, bitumen. Under these conditions I have found that the heat from the char causes an incomplete combustion of the hydrocarbon and the gases therefrom perf meate the pores of the heated char carrying {with them minute articles of carbon which particularly when reduced to a granular are deposited on t 0 surfaces and walls of no I content. The product may at this stage be conveniently reduced to granular .form' by with a reagent having such an action on :ertain of the inorganic constituents as partly to volatilize them and partly to reduce them to a condition whereby they may be washed out with water or, other suitable solvent or detergent.

I have discovered that hydrochloric acid is a reagent which has such an action on the inorganic constituents mentioned,in the above table causin the elimination from the char of much 0 the lime combined with carbon and sulphate of lime and also the soluble salts. q p

In carrying out this step in my process I prefer to boil the char in a dilute solution of the acid or otherwise to perform the operation under the influence of heat until the reactions above mentioned have taken place whereupon the resultant product is washed free from all acid and residue and thereafter dried.

The next step in my process involves the replacement of matter removed by the last ,mentioned step, with carbonaceous matter from an external source. This may be accomplishing by mixing the product resulting from the first step with carbonaceous ma.- terialsuch as bitumen or other hydrocarbon 35 or animal or vegetable oils, and heating the mixture in a retort or closed vessel.. The result of the heating is that the vapors thereby created permeate the char, and the finely divided carbon particles are deposited in the minute openings of its structure thus taking the place of the constituents which were eliminated-or and augmenting the carbon deposit there remaining by boiling and washing "process.

The mpregnating step last described can perhaps be carried out more advantageously y heating the hydrocarbon in a separate retortand allowing the vaporsresulting from distillation to be conducted to or passed through the granulated char contained in a,

separate vessel. In either case the vapors are allowed to pass through or are drawn through the char until it is thoroughly permeated and the surfaces of the ores covered with a coating of minute particles of carbon.

In addition to the increased the resultant product becomes a stabilized structure anddoes not break down through rehandling.

ventibn, modifications in detail may be folefiicacy of V It is obvious thatin the practice of my in the details above set forth, but what I wish to secure is set forth in the following claims: 1. The process of making a filtering and decolorizing agent which consists of boiling green bone, heatingit to redness, allowing 7 it to cool in" a closed receptacle in such proximity to a hydrocarbon as to effect the deposition of carbon particles. in the pores of the bone, subjecting the resulting product to the action of a re-agent that Wlll reduce hydrocarbon as to efi'ec't the de osition. of-

carbon particles in the pores o the bone, subjecting. the resulting product to the action of a reagent that will reduce a substantial part of the inorganic constituents to a condition whereby they may be dissolved or washed free' from the structure, washing the residue'from the structure and subjecting it to vapor arisin from the incomplete combustion of a hyfirocarbon.

3. In the process of making a. filtering a'nd decolorizing agent, the steps which consist in removing the fat from green bone, heating the resultant product out of contact with air and allowing it to cool in a closed receptacle in such proximit .to a hydrocarbon as to effect the deposition of carbon particles in the pores of the said product.

4. The process of making a filtering and decolorizing a ent which consists in removing the fat rom green bone, heating it, allowing the resultant product tocool in such proximity to a hydrocarbon in such manner as' to produce an incomplete combustion-of said hydrocarbon, subjecting the resultin product to the action of dilute hydroch oric acid until a substantial portion of the inorganic structure has been reacted upon by the said acid, washing the residue from the structure and subjecting the resultin'g 'product to a vapor arising from the incomplete combustion of a hydrocarbon.

5. The process of preparing a filtering and decolorizin exposingbone 'c ar to the action of hydrocarbon vapors while permitting the partial combustion of said vapors.

6. The process of preparin which consists of exposing the one char to permitting the partial combustion of said vapors.

agent which consists of bone char the action of hot hydrocarbon vapors while 7 7. The process of preparing afiltering and decolorizing agent which conslsts of" exposing bone char to the action of hydrocarbon vapors in a. closed vessel while permitting the partial combustion of said vapors.

8. The process of preparing bone char which consists of exposing the bone char: to the action of hot hydrocarbon vapors in a closed vessel while permitting the partial combustion of said vapors.

9. The process of preparing a filtering'and decolorizing agent from bone char which consists of depositing carbon in the pores of the action of hydrocarbon vapors while permitting the partial combustion of said vapors; v

10. The. process of preparing; a filtering and decolorizing agentf'rom bone char which consists of depositing carbon. in the pores of the bone char by exposing the. bone char to the action of hydrocarbon vapors in the presence of heat while permitting the partial combustion of said vapors.

11. The process of preparing bone char as a filtering and decolorizing medium by heating the said char with a dilute acid, then washing the char and thereafter exposing the char to the action of hydrocarbon vapors while permitting the partial combustion of said vapors.

the bone char by exposing the bone char to 12. The process of preparing bone char as I a filtering and decolorizing medium by heating the said char with a dilute acid, then washing the char and thereafter exposing the char to the action of hydrocarbon vapors in the presence of heat while permitting the partial combustion of said va rs.

13. The process of revivifylng ex 'nded bone char which consists of heating t e said char with a dilute acid then washing the char and thereafter exposing the char to the" action of hydrocarbon vapors while permit-4 ting the partial combustion of said vapors. 14. The process of revivifying expended bone char which consists of heating the said char with a dilute acid then washing the char and thereafter exposing the char to the action of, hydrocarbon vapors in the presence of heat while permitting the partial combustion of said va ors.

15. As an. artic e of manufacture bone char prepared as set forth in claim 5.

16 As an article of manufacture bone? char prepared asset forth in claim 9.

17. As an article of manufacture bone char prepared as set forth in claim 11.

18. As an article of manufacture bone char prepared asset forth in claim 13. i

' LILLIAN D. WOOS'IER, Administratrz'a: of the Estate 0 f Philip L;

Wooster, deceased. 

